|Publication number||US7044116 B2|
|Application number||US 10/511,726|
|Publication date||May 16, 2006|
|Filing date||Apr 11, 2003|
|Priority date||Apr 25, 2002|
|Also published as||CN1650145A, CN100390491C, DE10218521A1, DE50302299D1, EP1504231A1, EP1504231B1, US20050199227, WO2003091650A1|
|Publication number||10511726, 511726, PCT/2003/3769, PCT/EP/2003/003769, PCT/EP/2003/03769, PCT/EP/3/003769, PCT/EP/3/03769, PCT/EP2003/003769, PCT/EP2003/03769, PCT/EP2003003769, PCT/EP200303769, PCT/EP3/003769, PCT/EP3/03769, PCT/EP3003769, PCT/EP303769, US 7044116 B2, US 7044116B2, US-B2-7044116, US7044116 B2, US7044116B2|
|Inventors||Winfried Juschka, Rainer Lutz|
|Original Assignee||Behr Gmbh & Co. Kg|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (48), Referenced by (3), Classifications (24), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The invention relates to an exhaust heat exchanger in particular for motor vehicles having an exhaust gas recirculation system (EGR), composed of a housing jacket for a coolant, and of a nest of pipes through which exhaust gas flows on the inside and around which coolant flows on the outside and which is held in the housing jacket by means of pipe plates, the nest of pipes, pipe plates and housing jacket forming an enclosed structure—such an exhaust heat exchanger has been disclosed by DE-A 199 07 163 by the applicant.
This known exhaust heat exchanger is an exhaust gas radiator such as is used in motor vehicles for recirculating exhaust gases in order to cool the hot exhaust gases. The exhaust gas radiator which is manufactured from stainless steel is essentially composed of a housing with a housing jacket through which a coolant flows, said coolant being removed from the coolant circuit of the internal combustion engine of the motor vehicle. A nest of pipes whose pipe ends are held by pipe plates which are themselves connected to the housing jacket is arranged in the housing jacket. The pipe ends are welded tightly to the pipe plates and the pipe plates are welded at the circumference to the housing jacket. In this respect the two pipe plates form, together with the housing jacket, what are referred to as fixed bearings. When this exhaust gas radiator operates, the pipes and housing jacket heat up to differing degrees because the exhaust gases flowing through the pipes have a higher temperature than the coolant flowing around the housing jacket. As a result, different degrees of expansion between the nest of pipes and the housing jacket occur, which leads to thermally induced stresses, i.e. compressive stresses in the pipes and tensile stresses in the housing jacket and flexural stresses in the pipe plates. The pipes of the nest of pipes, the pipe plates which hold the pipe ends, and the housing jacket thus form an enclosed structure in which the pipes are supported on the housing jacket by means of the pipe plates. In particular, in the case of exhaust gas coolers with a long length, such as are used in utility vehicles, the stresses which occur owing to the different degrees of expansion can lead to individual components failing or to the connection between the pipe plates being destroyed.
The object of the present invention is to reduce these thermally induced stresses, i.e. to decrease the resulting stresses in the components of the exhaust heat exchanger in order to achieve higher safety and a longer service life for the exhaust heat exchanger mentioned in the beginning.
The means of solving this object is proposed by a sliding fit being arranged within each enclosing structure, i.e. a fit between two components which can slide in relation to one another, that is to say what is referred to as a loose bearing, in contrast to a fixed bearing such as is present in the prior art of the generic type. Such a sliding fit compensates for the different degrees of expansion of the nest of pipes and housing, i.e. the abovementioned stresses do not occur at all. The sliding fit can be installed structurally at any desired location of the enclosing structure, it being necessary where possible to avoid the coolant and exhaust gas becoming mixed with one another, which could lead to damage to the engine.
According to one advantageous development of the invention, the sliding fit is arranged in the housing. This solution has the advantage that relatively large sliding surfaces are available and that there is no risk of coolant becoming mixed with the exhaust gas, or vice versa when there is a leakage due to the sliding fit. The housing jacket is divided transversely with respect to the direction of the force flux, i.e., coolant flow, and both housing parts are assembled in a telescopic fashion so that, when the nest of pipes experiences severe expansions, they can be pulled apart from one another without stresses occurring in the housing jacket, in the pipe plate or in the nest of pipes.
According to one advantageous development the sliding fit is composed of an outer ring and an inner ring between which a plastic sliding layer is arranged in order to improve the sliding properties. Both rings are pushed onto the end regions of the housing parts of the prefabricated sliding fit, and preferably bonded to said housing parts. The bonding avoids excessive application of heat and thus possible distortion of the components. The fitting on and bonding of the internal ring and outer ring is advantageous in particular when the housing jacket has a somewhat rugged contour: the surfaces of the inner and outer ring which slide one on the other can be configured as simple contours which can be sealed satisfactorily, for example, as a polygonal contour.
According to one advantageous development of the invention, the sliding fit is arranged between one of the two pipe plates and the housing. This solution thus provides a fixed bearing and a loose bearing for the nest of pipes. As a result, the nest of pipes can expand freely with respect to the housing jacket so that the abovementioned compressive stresses do not occur in the pipes and the abovementioned tensile stresses do not occur in the housing jacket. The pipe plate which is embodied as a sliding fit thus has a sliding surface which slides along an assigned sliding surface of the housing jacket and is sealed with respect thereto, preferably by means of O rings.
According to one development of the invention, a drainage, which is connected to the atmosphere, is provided between the O rings, i.e. between two O rings. This drainage provides the advantage that the coolant and exhaust gas cannot mix if an O ring or a corresponding seal fails because either the exhaust gas or the coolant escape to the outside through the drainage.
According to one advantageous development, the drainage is embodied as a slit in the housing, i.e. the housing is divided by a joint and is held spaced apart by means of spacer sleeves which are arranged on the circumference. If the seal fails, exhaust gas or coolant can be conducted away to the outside through the slit.
According to one advantageous alternative, the drainage is formed between two O rings as an annular groove in which the leakage fluid or the leakage gas collect and can escape to the outside via drainage openings which are arranged in the annular groove. This solution is structurally simple since the housing does not need to be divided.
Exemplary embodiments of the invention are illustrated in the drawing and will be described in more detail below. In said drawing:
The outer ring 10 and inner ring 11, plastic sliding layer 14 and O rings 15 can be manufactured together as a prefabricated unit, i.e. as a prefabricated sliding fit 5, and then connected to the housing parts 2 a, 2 b by means of the bonded connection already mentioned.
When the exhaust gas radiator 1 is operating, the sliding fit 5 ensures that the housing 2 and the housing parts 2 a and 2 b can follow the relatively severe expansion of the pipes 3 by moving in relation to one another—thermal stresses and the excessive stresses of the components are thus avoided.
When the exhaust gas radiator 20 is operating, hot exhaust gases flow through the region 23 into the interior of the pipes 25, around which coolant, which flows around the inside of the housing jacket 21 flows on the outside, i.e. in the coolant region 22. Said housing jacket 21 is therefore at a lower temperature than that of the exhaust gas pipes 25. The greater degree of expansion of the exhaust gas pipes 25 is compensated by the sliding fit 31/32, i.e. the pipes can expand freely with respect to the housing jacket 21 by means of the pipe plate 24 and the cylindrical attachment 26. The seal between the coolant region 22 and exhaust gas region 23 is provided by means of the O rings 29, 30. If one of these O rings were to lose its sealing effect, coolant would leave the region 22 or exhaust gas would leave the region 23 and enter the slot 33 and pass from there to the outside and into the atmosphere. This prevents either exhaust gas entering the coolant region 22 or coolant entering the exhaust gas region 23 and thus causing damage.
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|U.S. Classification||123/568.12, 165/86|
|International Classification||F28F9/02, F02B47/08, F02M31/20, F01N3/02, F28D7/16, F02M25/07|
|Cooperative Classification||F01N3/0205, Y02T10/121, F28F2265/16, F28F9/0241, F28D7/1684, F02M25/0714, F02M31/20, Y02T10/20, F02M25/0737, F28D21/0003, F28F2265/26|
|European Classification||F01N3/02E, F28F9/02F4, F28D7/16H, F02M25/07P6D6, F02M25/07M|
|Oct 18, 2004||AS||Assignment|
Owner name: BEHR GMBH & CO. KG, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JUSCHKA, WINFRIED;LUTZ, RAINER;REEL/FRAME:016594/0502;SIGNING DATES FROM 20040903 TO 20040906
|Nov 13, 2009||FPAY||Fee payment|
Year of fee payment: 4
|Dec 27, 2013||REMI||Maintenance fee reminder mailed|
|Apr 17, 2014||FPAY||Fee payment|
Year of fee payment: 8
|Apr 17, 2014||SULP||Surcharge for late payment|
Year of fee payment: 7